Franco Zeffirelli's 1968 version of Shakespeare's Romeo and Juliet was touted at the time of its release (successfully, if the box-office receipts are any indication), as something of a "youth trip" movie. This is because Zeffirelli broke the long-standing tradition of casting over-aged, sometimes grey-haired players in the title roles.
Seventeen-year-old Leonard Whiting plays Romeo, with 15-year-old Olivia Hussey as Juliet. The youthfulness and inexperience of the leading players works beautifully in the more passionate sequences (some of these breaking further ground by being played in the nude). Among the younger players are Michael York as Tybalt and John McEnery as Mercutio.
Photographed by Pasqualino DeSantis on various locations in Italy, Romeo and Juliet was one of the most profitable film adaptations of Shakespeare ever produced - and is still considered perhaps even the greatest. (With a memorable theme by Nino Rota to boot.)